static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,enum v4l2_field field)
{
struct file *file = q->priv_data;
struct saa7146_fh *fh = file->private_data;
struct saa7146_dev *dev = fh->dev;
struct saa7146_buf *buf = (struct saa7146_buf *)vb;
int err = 0;
int lines, llength, size;
lines = 16 * 2 ; /* 2 fields */
llength = vbi_pixel_to_capture;
size = lines * llength;
DEB_VBI("vb:%p\n", vb);
if (0 != buf->vb.baddr && buf->vb.bsize < size) {
DEB_VBI("size mismatch\n");
return -EINVAL;
}
if (buf->vb.size != size)
saa7146_dma_free(dev,q,buf);
if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
buf->vb.width = llength;
buf->vb.height = lines;
buf->vb.size = size;
buf->vb.field = field; // FIXME: check this
saa7146_pgtable_free(dev->pci, &buf->pt[2]);
saa7146_pgtable_alloc(dev->pci, &buf->pt[2]);
err = videobuf_iolock(q,&buf->vb, NULL);
if (err)
goto oops;
err = saa7146_pgtable_build_single(dev->pci, &buf->pt[2],
dma->sglist, dma->sglen);
if (0 != err)
return err;
}
buf->vb.state = VIDEOBUF_PREPARED;
buf->activate = buffer_activate;
return 0;
oops:
DEB_VBI("error out\n");
saa7146_dma_free(dev,q,buf);
return err;
}
void *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
{
int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
void *mem = vmalloc_32(length);
int slen = 0;
if (NULL == mem)
goto err_null;
if (!(pt->slist = vmalloc_to_sg(mem, pages)))
goto err_free_mem;
if (saa7146_pgtable_alloc(pci, pt))
goto err_free_slist;
pt->nents = pages;
slen = pci_map_sg(pci,pt->slist,pt->nents,PCI_DMA_FROMDEVICE);
if (0 == slen)
goto err_free_pgtable;
if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen))
goto err_unmap_sg;
return mem;
err_unmap_sg:
pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
err_free_pgtable:
saa7146_pgtable_free(pci, pt);
err_free_slist:
kfree(pt->slist);
pt->slist = NULL;
err_free_mem:
vfree(mem);
err_null:
return NULL;
}
static int saa7146_pgtable_build(struct saa7146_dev *dev, struct saa7146_buf *buf)
{
struct pci_dev *pci = dev->pci;
struct scatterlist *list = buf->vb.dma.sglist;
int length = buf->vb.dma.sglen;
struct saa7146_format *sfmt = format_by_fourcc(dev,buf->fmt->pixelformat);
DEB_EE(("dev:%p, buf:%p, sg_len:%d\n",dev,buf,length));
if( 0 != IS_PLANAR(sfmt->trans)) {
struct saa7146_pgtable *pt1 = &buf->pt[0];
struct saa7146_pgtable *pt2 = &buf->pt[1];
struct saa7146_pgtable *pt3 = &buf->pt[2];
u32 *ptr1, *ptr2, *ptr3;
u32 fill;
int size = buf->fmt->width*buf->fmt->height;
int i,p,m1,m2,m3,o1,o2;
switch( sfmt->depth ) {
case 12: {
/* create some offsets inside the page table */
m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
m2 = ((size+(size/4)+PAGE_SIZE)/PAGE_SIZE)-1;
m3 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
o1 = size%PAGE_SIZE;
o2 = (size+(size/4))%PAGE_SIZE;
DEB_CAP(("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",size,m1,m2,m3,o1,o2));
break;
}
case 16: {
/* create some offsets inside the page table */
m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
m2 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
m3 = ((2*size+PAGE_SIZE)/PAGE_SIZE)-1;
o1 = size%PAGE_SIZE;
o2 = (size+(size/2))%PAGE_SIZE;
DEB_CAP(("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",size,m1,m2,m3,o1,o2));
break;
}
default: {
return -1;
}
}
ptr1 = pt1->cpu;
ptr2 = pt2->cpu;
ptr3 = pt3->cpu;
/* walk all pages, copy all page addresses to ptr1 */
for (i = 0; i < length; i++, list++) {
for (p = 0; p * 4096 < list->length; p++, ptr1++) {
*ptr1 = cpu_to_le32(sg_dma_address(list) - list->offset);
}
}
/*
ptr1 = pt1->cpu;
for(j=0;j<40;j++) {
printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
}
*/
/* if we have a user buffer, the first page may not be
aligned to a page boundary. */
pt1->offset = buf->vb.dma.sglist->offset;
pt2->offset = pt1->offset+o1;
pt3->offset = pt1->offset+o2;
/* create video-dma2 page table */
ptr1 = pt1->cpu;
for(i = m1; i <= m2 ; i++, ptr2++) {
*ptr2 = ptr1[i];
}
fill = *(ptr2-1);
for(;i<1024;i++,ptr2++) {
*ptr2 = fill;
}
/* create video-dma3 page table */
ptr1 = pt1->cpu;
for(i = m2; i <= m3; i++,ptr3++) {
*ptr3 = ptr1[i];
}
fill = *(ptr3-1);
for(;i<1024;i++,ptr3++) {
*ptr3 = fill;
}
/* finally: finish up video-dma1 page table */
ptr1 = pt1->cpu+m1;
fill = pt1->cpu[m1];
for(i=m1;i<1024;i++,ptr1++) {
*ptr1 = fill;
}
/*
ptr1 = pt1->cpu;
ptr2 = pt2->cpu;
ptr3 = pt3->cpu;
for(j=0;j<40;j++) {
printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
}
for(j=0;j<40;j++) {
printk("ptr2 %d: 0x%08x\n",j,ptr2[j]);
}
for(j=0;j<40;j++) {
printk("ptr3 %d: 0x%08x\n",j,ptr3[j]);
}
*/
} else {
struct saa7146_pgtable *pt = &buf->pt[0];
return saa7146_pgtable_build_single(pci, pt, list, length);
}
return 0;
}
